Physics 1408

Since you may take the online quizzes as often as you like, your highest average should be pretty good. However, in order to keep track, you must fill out the student name and id# part of the form.

Question 1. A cart is pulled to the right with a force of 100 N and to the left with a force of 20 N. The net force on the cart (in N) is

(a) 10 right    (b) 30 left     (c) 50 left     (d) 80 right     (e) 120 right

 

 

Question 2. If the cart in the previous question has a mass of 40 kg, then it will have an acceleration (in m/s²) of

(a) 1 left    (b) 2 right     (c) 3 right     (d) 5 left     (e) 10 right

 

 

Question 3. What is the acceleration (in m/s²) of a 10-kg pail of cement that is pulled upward with a force of 120 N?

(a) 0     (b) 2 up     (c) 10 down     (d) 12 up     (e) 12 down

 

 

Question 4. Gravity on the moon is g/6. The weight (in N) of a 6-kg object on the moon is

(a) 0     (b) 2     (c) 6     (d) 10     (e) 60

 

 

Question 5. The weight (in N) of the same 6-kg object on the earth is

(a) 0     (b) 2     (c) 6     (d) 10     (e) 60

 

 

Question 6. A 1-kg rock is thrown at 10 m/s straight up. Neglecting air resistance, the net force (in N) on the rock when it is halfway to the top of its trajectory is

(a) 0     (b) 5 up     (c) 5 down     (d) 10 up     (e) 10 down

 

 

Question 7. If you stand on a skateboard next to a wall and then push on the wall to your right with a force of 60 N, the wall exerts a force (in N) of

(a) 0     (b) 60 right     (c) 60 left     (d) 120 right     (e) 120 left

 

 

Question 8. If your mass plus that of the skateboard from the previous problem is 60 kg, then your acceleration (in m/s²) is

(a) 1 left     (b) 2 right     (c) 3 right     (d) 5 left     (e) 10 right

 

 

Question 9. A person stands on a bathroom scale in an express elevator that accelerates upward at 10 m/s². Instead of the person's "normal" weight of 1000 N, the scale reading (in N) will be

(a) 0     (b) 1000     (c) 2000     (d) 5000     (e) 10000

 

 

Question 10. A 1-kg mass on a flat frictionless table is connected by a massless string over a frictionless pulley to another 1-kg mass that is hanging over the edge of the table. The acceleration of the two blocks (in m/s²) is

(a) 0     (b) 2     (c) 5     (d) 8     (e) 10

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